SYNAPTOMYS 169 



1. Synaptomys (Synaptomys) cooperi Baird. 

 1857. Synaptomys cooperi Baird, Mamm. N. America, p. 558. 



1893. Synaplomi/fi slonel Rhoads, Amer. Nat., 27, p. 53; described 

 from May's Landing, Atlantic County, New Jersey; type in 

 collection of S. N. llhoads. 



1894. Si/naptomi/s cooperi Bangs, Proc. Biol. Soc. Washington, 9, 

 p. 99; Miller, " List," 1924, p. 394. 



Co-types. — U.S. National Museum. 



Type locality. — Unknown ; j^robably northern New Jersey 

 or southern New York. 



Range. — Eastern United States from Minnesota eastwards 

 to eastern Massachusetts ; south to Iowa, Indiana, and Mary- 

 land, and in the mountains to North Carolina and Tennessee. 

 In the Boreal and parts of the Transition Zones, finding,' a 

 boreal atmosj^here south of the Boreal Zone in cold sphagnum 

 swamps. 



Characters. — Distinguished from *S'. helaletes by smaller feet 

 and lighter skull. Hind-foot 18 mm. 



Colour of ujiper parts grizzled grey and yellowish brown 

 abundantly mLxed with black-tipped hairs ; under j^arts dirty 

 white darkened by the hair-bases. Tail bicoloured, brownish 

 above, whitish below. 



Skull and teeth relatively small and weak comjjared with 

 those of <S'. helaletes ; zygomata more widely sj)reading ; brain- 

 case shorter; rostrum, nasals, and uj^per incisors narrower. 

 Mandible less robust. 



For external and cranial measurements, see tables at end of 

 volume. 



2. Synaptomys (Synaptomys) fatuus Bangs. 



1896. Synaptomys fatuus Bangs, Proc. Biol. Soc. Washington, 10, 

 p. 47; Miller, " List," 1924, p. 394. 



1897. Synaptomys cooperi fatuus Rhoads, Proc. Acad. Nat. Sci. 

 Philadelphia, 1897, p. 306. 



Type. — Collection of E. A. and 0. Bangs. 



Type locality. — Lake Edward, Quebec, Canada. 



Range. — Quebec, Ontario, and New Brunswick; limits of 

 range unknown. 



Characters. — Very similar to »S'. cooperi but described as 

 slightly smaller, with decidedly smaller skull and narrower 

 upper incisors. Hind-foot 18-19 mm. 



Colour of upper parts grizzled yellowish brown, abundantly 

 mixed with black-tipped hairs ; under parts varying from slate- 

 grey to whitish washed with buff on belly. Tail only slightly 

 paler below than above. 



Skull similar to that of S. cooperi but described as smaller 

 I and weaker, with narrower rostrum; the basisphenoid broader 

 posteriorly ; upper incisors very much narrower. 



v.L. N 



